742138740 has 192 divisors, whose sum is σ = 2794176000. Its totient is φ = 159639552.

The previous prime is 742138721. The next prime is 742138751. The reversal of 742138740 is 47831247.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 742138695 and 742138704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58486 + ... + 70034.

It is an arithmetic number, because the mean of its divisors is an integer number (14553000).

Almost surely, 2^742138740 is an apocalyptic number.

742138740 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 742138740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1397088000).

742138740 is an abundant number, since it is smaller than the sum of its proper divisors (2052037260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

742138740 is a wasteful number, since it uses less digits than its factorization.

742138740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11591 (or 11583 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 742138740 is about 27242.2234775357. The cubic root of 742138740 is about 905.3747275541.

Adding to 742138740 its reverse (47831247), we get a palindrome (789969987).

The spelling of 742138740 in words is "seven hundred forty-two million, one hundred thirty-eight thousand, seven hundred forty".